Metric Thread Pitch Reference Guide
| Diameter (mm) | Coarse (Standard) | Fine | Extra Fine | Superfine |
|---|---|---|---|---|
| M1 | 0.25 | 0.2 | ||
| M1.6 | 0.35 | 0.2 | ||
| M2 | 0.4 | 0.25 | ||
| M2.5 | 0.45 | 0.35 | ||
| M3 | 0.5 | 0.35 | ||
| M3.5 | 0.6 | 0.35 | ||
| M4 | 0.7 | 0.5 | ||
| M5 | 0.8 | 0.5 | ||
| M6 | 1 | 0.75 | ||
| M7 | 1 | 0.75 | ||
| M8 | 1.25 | 1 | 0.75 | |
| M10 | 1.5 | 1.25 | 1 | 0.75 |
| M12 | 1.75 | 1.5 | 1.25 | 1 |
| M14 | 2 | 1.5 | 1.25 | 1 |
| M15 | 1 |
| Diameter (mm) | Coarse (Standard) | Fine | Extra Fine | Superfine |
|---|---|---|---|---|
| M16 | 2 | 1.5 | 1 | |
| M17 | 1 | |||
| M18 | 2.5 | 2 | 1.5 | 1 |
| M20 | 2.5 | 2 | 1.5 | 1 |
| M22 | 2.5 | 2 | 1.5 | 1 |
| M24 | 3 | 2 | 1.5 | 1 |
| M25 | 1.5 | |||
| M27 | 3 | 2 | 1.5 | 1 |
| M30 | 3.5 | 2 | 1.5 | 1 |
| M35 | 1.5 | |||
| M36 | 4 | 3 | 2 | 1.5 |
| M42 | 4.5 | 3 | 2 | 1.5 |
| M48 | 5 | 3 | 2 | 1.5 |
| M56 | 5.5 | 4 | 2 | 1.5 |
| M64 | 6 | 4 | 3 | 2 |
Standard Descriptions
- ISO 4032: Standard height, Style 1 hexagon nuts (similar to DIN 934). Used for coarse threads.
- ISO 4035: Chamfered hexagon thin nuts. Used for lower-load applications or as lock nuts with coarse threads.
- ISO 8673: Standard height, Style 1 hexagon nuts with metric fine pitch thread.
- ISO 8674: Hexagon high nuts (Style 2) with metric fine pitch thread, offering greater thread engagement.
- ISO 8675: Hexagon thin nuts with metric fine pitch thread, suitable for locking purposes.
- ISO 8676: Hexagon head screws with metric fine pitch thread. Ideal for applications requiring fine adjustment.
- DIN 981: "KM" type locknuts with four slots, used for securing bearings on a shaft.
- DIN 70852: Slotted locknuts, often used with tab washers to prevent loosening.
This guide details metric thread pitch sizes for different bolt diameters. It covers four main thread types: Coarse (Standard), Fine, Extra Fine, and Superfine.
Frequently Asked Questions
What does the Metric Thread Pitch Reference Guide show?
It shows complete metric thread pitch specifications for all bolt diameters, including standard, fine, extra fine, and superfine pitches.
How do I use it?
Find your bolt diameter in the table to see the available thread pitch options — coarse, fine, or extra fine — for that size.
Is it free?
Yes. This Kod5 reference page is free to use in the browser.